2-Alkyl-cycloalk(en)yl-carboxamide compounds (I) are new. 2-Alkyl-cycloalk(en)yl-carboxamide compounds (I) of formula (A-CO-N(R 1>；)-L-CH 2(R 2>；)-(CH 2) s-X) are new. X : -CR 3>；R 4>；R 5>； or -SiR 49>；R 50>；R 51>；； s : 1-2； R 1>；H, 1-8C alkyl, 1-6C alkylsulfinyl, 1-6C alkylsulfonyl, 1-4C alkoxy-1-4C-alkyl, 3-8C cycloalkyl, 1-6C haloalkyl, 1-4C haloalkylthio, 1-4C haloalkylsulfinyl, 1-4C haloalkylsulfonyl, halo-1-4C-alkoxy-1-4C-alkyl, 3-8C halocycloalkyl (with 1-9 of F, Cl and/or Br), formyl, formyl-1-3C-alkyl, (1-3C-alkyl)carbonyl-1-3C-alkyl, (1-3C-alkoxy)carbonyl-1-3C-alkyl, halo-(1-3C-alkyl)carbonyl-1-3C-alkyl, halo-(1-3C-alkoxy)carbonyl-1-3C-alkyl (with 1-13 of F, Cl and/or Br), (1-8C-alkyl)carbonyl, (1-8C-alkoxy)carbonyl, (1-4C-alkoxy-1-4C-alkyl)carbonyl, (3-8C-cycloalkyl)carbonyl, (1-6C-haloalkyl)carbonyl, (1-6C-haloalkoxy)carbonyl, (halo-1-4C-alkoxy-1-4C-alkyl)carbonyl, (3-8C-halocycloalkyl)carbonyl (with 1-9 of F, Cl and/or Br), -C(=O)C(=O)R 6>；, -CONR 7>；R 8>； or -CH 2NR 9>；R 10>；； L : L 1>； or L 2>；； L 1>；3-7C cycloalkyl-1,2-ene (3-7C-cycloalkyl-1,2-diyl) (optionally substituted by 1-4 of F, Cl, 1-4C alkyl or 1-4C haloalkyl)； L 2>；cyclohexenylene (cyclohexendiyl) (optionally substituted by 1-4 of F, Cl, 1-4C alkyl or 1-4C haloalkyl)； R 2>；H, halo, 1-4C alkyl or 1-4C haloalkyl with 1-9 of F, Cl and/or Br； either R 3>；halo, 1-8C alkyl or 1-6C haloalkyl with 1-13 of F, Cl and/or Br； and R 4>；halo, 1-8C alkyl or 1-6C haloalkyl with 1-13 of F, Cl and/or Br； or CR 3>；R 4>；3-6 membered, optionally unsaturated, carbocyclic or heterocyclic ring (optionally substituted with halo, 1-4C alkyl, 1-4C alkoxy, 1-4C haloalkyl or 1-4C haloalkoxy)； R 5>；H, halo, 1-8C alkyl or 1-6C haloalkyl with 1-13 of F, Cl and/or Br； R 49>；, R 50>；H, 1-8C alkyl, 1-8C alkoxy, 1-4C alkoxy-1-4C-alkyl, 1-4C alkylthio-1-4C-alkyl or 1-6C haloalkyl； R 51>；phenyl, phenylalkyl (both optionally substituted), H, 1-8C alkyl, 1-8C alkoxy, 1-4C alko
